The date_modify
filter modifies a date with a given modifier string:
{{ post.published_at|date_modify("+1 day")|date("m/d/Y") }}
The date_modify
filter accepts strings (it must be in a format supported by the strtotime function) or DateTime instances. You can easily combine it with the date filter for formatting.
modifier
: The modifier
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http://twig.sensiolabs.org/doc/2.x/filters/date_modify.html